I looked at a lot of broken stuff back when I designed PMD main girdle’s, looking for failures and trying to figure out what some of the causes were. Too me it looked like a lot of the crank failures had too do with bad harmonic balancers. I learned the hard way a long time ago moving the same balancer to a blown engine and had the problems follow the balancer from engine to engine. It why I mentioned not to reuse a balancer from a bad crank, found out first hand it is a bad idea.
Here’s another failure I recall that broke a crank. Member HO428, I think he was road racing.
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